<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport"
    content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no,viewport-fit=cover">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>MVC Demo</title>
</head>

<body>
  <div class="page">
    <section id="app1">
      <div class="output">
        <span id="number">100</span>
      </div>
      <div class="actions">
        <button id="add1">+1</button>
        <button id="minus1">-1</button>
        <button id="mul2">*2</button>
        <button id="divide2">÷2</button>
      </div>
    </section>
    <section id="app2">
      <ol class="tab-bar">
        <li><span>1111</span></li>
        <li><span>2222</span></li>
      </ol>
      <ol class="tab-content">
        <li>内容1</li>
        <li>内容2</li>
      </ol>
    </section>
    <section id="app3">
      <div class="square"></div>
    </section>
    <section id="app4">
      <div class="circle"></div>
    </section>
  </div>
  <script src="main.js"></script>
</body>

</html>